Centrifugal pulp-drier



(No Model.) 2 Sheets-Sheet 1.

S. S. STEVENS. GENTRIFUGAL PULP DRIER.

Patented Nov. 4, 1890.

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OBNT RIFUGAL PULP DRIER. No. 439,700. Patented Nov. 4, 1890.

WITNESSES, "a!

UNITED STATES PATENT OFFICE.

SAMUEL S. STEVENS, OF NORTH HOOSICK, NEWV YORK.

CENTRIFUGAL PU LP-DRIER.

SPECIFICATION forming part of LettersPatent No. 439,700, dated November 4, 1890. Application filed July 26, 1889. Serial No. 318,774. (No model.)

To all whom it may concern: I

Be it known that I, SAMUEL S. STEVENS, a resident of North Hoosick, in the county of Rensselaer and State of New York, have invented certain new and useful Improvements in Centrifugal Pulp-Driers; and I do hereby declare that the following is a full, clear, and exact description of the invention, that will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

Similar letters refer to similar parts in the several figures therein.

My invention relates to improvements in centrifugal pulp-driers; and it consists of the novel construction and combination of parts hereinafter described, and subsequently claimed.

Figurel of the drawings is a top plan View of my improved machine. Fig. 2 is an end elevation of same. Fig. 3 isa horizontal longitudinal section taken on the broken line 3 3 in Fig. 2. Fig. at is a top plan view of the friction-rolls and their bearings attached.

The object of my invention is to cheaply and rapidly extract water from pulp, and by reducing its weight to lessen the expense of shipping it.

I convey a stream of wet pulp in liquid form into a rapidly-revolving perforated shell or hollow cylinder open at its ends, and preferably having its inlet-opening contracted; and I provide a stripping device interiorly of the shell adapted to strip the pulp from'its interior surface as it is deposited thereon by the centrifugal force generated by the revolving shell.

A is the perforated shell having numerous perforations A for the exit of the extracted water. The shell has the general form of a frustum of a cone and is provided exteriorly at or near its ends with bearingfianges A and A adapted to enter corre sponding grooves B in the friction-rolls B. The axles B of the rolls have their bearings in the side plates of the troughs B one at each end of the shell directly beneath the the floor B or other support by the bolts or screws B At each end of the troughs an arch or yoke B is erected. These arches serve to support a water-screen B secured thereto, as by screws B at each end. They also serve to support a shaft 0, rotating in bearings O, secured to the arches by screws 0 The shaft is provided with a drivingpulley C fixed thereon and with the pulley (J fixed thereon, and connected by belt 0 with a pulley 0 the spokes and hub of pulley 0 being broken away to better show the other parts. The pulley (3 is fixed upon the end of the stripper-shaft O", which has its hearings in the oscillatory links 0 pendent from the shaft (Jone at each end of the shell.

The stripper-shaft C may be provided with any known form of stripping devices. I have shown projecting teeth (3 at one end and a serrated blade 0 at the other end, extending spirally around the shaft. The stripper-teeth project farther from their supporting-shaft at its end located within the expanded opening of the shell, than they do at its other end, so that the ends of all the teeth approach to about the same distance from the interior surface of the shell when the stripper-shaft O rotates about an axial line parallel with the axial line of the shell.

When desired, the stripper-shaft may have all its teeth of equal length and haveits axial line parallel with one of the sides of the shell, as indicated by the broken lines a b in Fig. 3. As shown in Fig. 2, the stripper is located near the interior surface of the shell at one side of its axial center, and is provided with means for communicating to the stripper and its supports an oscillatory movement between such interior surface of the shell and axial center consisting of the eccentric D, fixed upon shaft D and having its strap D connected by rod'D with the link 0 The shaft D is supported bysuitable bearings D secured to the arches as shown, and can be rotated at any desired speed by suitable power (not shown) applied through pulley D Revoluble movement maybe communicated to the shell itself in a well-known manner by means of the belt F, passed over the shell upon the convexed pulleysurface F and down through the floor toa driving-pulley beneath, (not shown;) but I prefer ordinarily to impart rotary motion to the shell by means of supporti11g-rollers,as hereinafter described. This beltnot only serves to communicate revoluble movement to the shell, but to hold the same down in place upon its supporting friction-rolls.

The wet pulp is introduced in aliquid form into the contracted inlet of the shell through the supply-pipe F leading from a source of supply. (Not shown.) J ustinside theinletthe shell is provided with the interiorly-projecting flange A adapted to prevent the liquid pulp from spilling from the inlet.

The operation of the device is as follows: Revoluble movement of the shell is maintained and the pulp admitted through supplypipe F and the inletopening, whereupon it is forcibly pressed against the perforated shell by centrifugal force until the Water is extracted, being driven by centrifugal force through the perforations in the shell and escaping beneath the floor. The stripper serves to loosen the pulp from the surface of the shell and assist it on its passage through the shell and out of the expanding opening, to which it is continually impelled by the pressure upon the inclined sides of the shell. The pulp in its passage through the shell parts with the water, which passes through the perforations in the shell, and emerges from the expanded end in a continuous flow of dry pulp.

\Vhen desired, the axles of the friction-rollers may be extended, as shown by dotted lines in Fig. l, and provided with pulleys J J fixed thereon, the pulleys J J being connected with each other by a belt J and the pulley J connected with suitable power for the purpose of imparting to the shell the required revoluble movement, in which case the belt F may be dispensed with.

In describing my improved device I have only referred to its use in extracting water from pulp; but I do not wish to be limited in its application to any particular use. It may be employed to extract any substance in a fluid form from a solid substance. The shell is supported in a horizontal position, one side resting upon the friction rollers. I am thus able to communicate revoluble move ments to the shell about a horizontal axis, and leave the interior of the shell open and unobstructed to receive the oscillatory stripper-shaft. The stripper-shaft bearings can be movabl y supported in any known manner, as well as by the oscillatory links 0*, and can be adjusted by the hand or in any known manner, as Well as by the eccentric D.

lam aware that rotary cylinders have been provided Wit-l1 means for charging material into one end, and with blades for conveying it along the bottom of said cylinders to be discharged at the opposite end, and such construction is not of myinvention; but my claim is limited to other features, which are hereinafter pointed out.

What I claim as new, and desire to secure by Letters Patent, is

1. In a centrifugal pulp-drier, the combination, with a frusto-conical open-ended perforated shell revoluble about a horizontal axis and provided with a roller-engaging peripheral flange, of shell-supporting frictionrollers and means for communicating revoluble movements to the shell, a Wet-pnlp-supply pipe leading into the smaller end of the shell, a stripper rotary in movable bearings, by which it is adjustably supported within the shell, means for communicating rotary movements to the stripper, and means for communicating lateral movements to the strippershaft bearings, substantially as described.

2. In a centrifugal pulp-drier, the combination, with an open-ended perforated shell revoluble about a horizontal axis, of shellsupporting friction-rollers, means for communicating revoluble movements to such shell, a wet-pnlp-supply pipe leading into one end of the shell, a stripper located within the shell and rotary in pendent oscillatory bearings, means for rotating the stripper, and means for communicating oscillatory movements to the stripper-bearings, substantially as described.

In a centrifugal pulp-drier, the combination, with an open-ended perforated frustoconical shell revoluble about a central horizontal axis, of shell-supporting friction-rollers, means forcommunicatingrevoluble movement to the shell, a wetpulp-supply pipe leading into the smaller end of the shell, a stripper located within the shell and rotary upon an axis parallel with a tapered side of the shell, and means for communicating rotary movements to such stripper, substantially as described.

In testimony whereof I have hereunto set my hand this 20th day of July, 1889.

SAMUEL S. STEVENS. 

